The dev team is completely dedicated to getting the most out of each platform, so the notion that we would actively downgrade quality is contrary to everything we've set out to achieve. We test and optimize our games for each platform on which they're released, striving for the best possible quality. The PC version does indeed contain some old, unused render settings that were deactivated for a variety of reasons, including possible impacts on visual fidelity, stability, performance and overall gameplay quality. Modders are usually creative and passionate players, and while we appreciate their enthusiasm, the mod in question (which uses those old settings) subjectively enhances the game's visual fidelity in certain situations but also can have various negative impacts. Those could range from performance issues, to difficulty in reading the environment in order to appreciate the gameplay, to potentially making the game less enjoyable or even unstable.

Thanks for playing Watch Dogs and stay safe on the mean streets of Chicago.

-The Watch Dogs Team

As we previously detailed, some users did report that they had performance issues when they tried out the mod in question—but in general, most people seem to agree that it objectively improved the graphics thanks to a variety of tweaks that changed stuff like shaders and camera angles.